Actually there is no color in magic.Color can be used to inspire you,but you give each color its power.Witchcraft is just done with good or bad intention.Not every witch will follow the 3fold law either.Some don't believe in Karma either.Magic or witchcraft should not be used unless you have studied it well and learned that it shouldn't be used for everything.You should try to solve a problem without it first.Many witches curse or Hex as they wish without regards to rules it depends on what they believe.Some witches practice no magic or witchcraft at all.The biggest thing to remember is that you must not mess with a persons free will.Just like a love spell shouldn't be used because that person should have the choice.The best thing you can do in that instance is work magic on yourself to make you a person that will attract what your looking for.Its a craft where you need to be really specific in what you ask for and you really shouldn't ask for something your not ready for or something that you can get without it.It too depends on what type of path your on.Like if you also decide you want to be a wiccan a branch of paganism most do follow a 3fold law.Not all witches are pagan though.I have practiced it most of my life and i don't follow a 3fold law and i have Hexed many times.They only work on people that believe they will anyway.My magic always works for me,but i have been trained well.A Spell is nothing more than a wish or a prayer done with great intent.I wish you well with your studies there is a lot out there to learn.Good Journey and a Clear Path to you.